// SPDX-License-Identifier: GPL-2.0-or-later /* Support for hardware buffer manager. * * Copyright (C) 2016 Marvell * * Gregory CLEMENT <gregory.clement@free-electrons.com> */ #include <linux/kernel.h> #include <linux/printk.h> #include <linux/skbuff.h> #include <net/hwbm.h> void hwbm_buf_free(struct hwbm_pool *bm_pool, void *buf) { if (likely(bm_pool->frag_size <= PAGE_SIZE)) skb_free_frag(buf); else kfree(buf); } EXPORT_SYMBOL_GPL(hwbm_buf_free); /* Refill processing for HW buffer management */ int hwbm_pool_refill(struct hwbm_pool *bm_pool, gfp_t gfp) { int frag_size = bm_pool->frag_size; void *buf; if (likely(frag_size <= PAGE_SIZE)) buf = netdev_alloc_frag(frag_size); else buf = kmalloc(frag_size, gfp); if (!buf) return -ENOMEM; if (bm_pool->construct) if (bm_pool->construct(bm_pool, buf)) { hwbm_buf_free(bm_pool, buf); return -ENOMEM; } return 0; } EXPORT_SYMBOL_GPL(hwbm_pool_refill); int hwbm_pool_add(struct hwbm_pool *bm_pool, unsigned int buf_num) { int err, i; mutex_lock(&bm_pool->buf_lock); if (bm_pool->buf_num == bm_pool->size) { pr_warn("pool already filled\n"); mutex_unlock(&bm_pool->buf_lock); return bm_pool->buf_num; } if (buf_num + bm_pool->buf_num > bm_pool->size) { pr_warn("cannot allocate %d buffers for pool\n", buf_num); mutex_unlock(&bm_pool->buf_lock); return 0; } if ((buf_num + bm_pool->buf_num) < bm_pool->buf_num) { pr_warn("Adding %d buffers to the %d current buffers will overflow\n", buf_num, bm_pool->buf_num); mutex_unlock(&bm_pool->buf_lock); return 0; } for (i = 0; i < buf_num; i++) { err = hwbm_pool_refill(bm_pool, GFP_KERNEL); if (err < 0) break; } /* Update BM driver with number of buffers added to pool */ bm_pool->buf_num += i; pr_debug("hwpm pool: %d of %d buffers added\n", i, buf_num); mutex_unlock(&bm_pool->buf_lock); return i; } EXPORT_SYMBOL_GPL(hwbm_pool_add);